We did a Discover Scuba Dive earlier this summer, which was what prompted me to get back into diving (having got to RD and then not dived for several years) and my girlfriend to do her OW. It wasn’t much training at all. I think it felt safe though-we were taught some minimum safety skills (mask clearance, a few other things) and we dived slowly along a shore reef at about 4m along an out and back route for half an hour, two of us and a DM. My gf didn’t know how to fin so spent a lot of time trying to ‘walk’ in mid-water, and she bolted for the surface at one point. From a safety perspective I wasn’t concerned because we were (deliberately) so shallow. I’d be interested to hear yours and others’ opinions though, although do bear in mind it was a DSD and nothing more. Subsequently she’s found her OW course and the confined water dives have ‘worked’ for her in building her confidence, as someone who didn’t take to it naturally (like a duck to water lol). Of course, it’s only one anecdote though.
There’s also the factor that she needs to reach required standards and demonstrate certain skills in order to pass, and the school we have been using seems to be pretty professional in that and other regards. When I did my Deep specialty last weekend with the same school, I understood that although I only had to reach a basic standard, I wouldn’t get a ‘hospital pass’. Again, I know this is one anecdote and one school.
I did a pool DSD (that’s how they’re done in the Midwest) summer 2016. Inspired by a friend who dived. Enjoyed it enough I did my OW cert, finishing Oct 2016. I was scared and not that comfortable in the water, but wanted to do it since I could get to see my beloved Great Lakes shipwrecks. Did my first shallow wreck dives in 2017. I got full cave in August and I’m in the midst of CCR training. It can be done by someone not originally a good candidate, but you’ve got to grit your teeth and just be stubborn.